arch/s390/kernel/diag.c

   1 /*
   2  * Implementation of s390 diagnose codes
   3  *
   4  * Copyright IBM Corp. 2007
   5  * Author(s): Michael Holzheu <holzheu@de.ibm.com>
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/cpu.h>
  10 #include <linux/seq_file.h>
  11 #include <linux/debugfs.h>
  12 #include <asm/diag.h>
  13
  14 DEFINE_PER_CPU(struct diag_stat, diag_stat);
  15 EXPORT_PER_CPU_SYMBOL(diag_stat);
  16
  17 struct diag_desc {
  18         int code;
  19         char *name;
  20 };
  21
  22 static const struct diag_desc diag_map[NR_DIAG_STAT] = {
  23         [DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" },
  24         [DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" },
  25         [DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" },
  26         [DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" },
  27         [DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" },
  28         [DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" },
  29         [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" },
  30         [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" },
  31         [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" },
  32         [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" },
  33         [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" },
  34         [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" },
  35         [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" },
  36         [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" },
  37         [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" },
  38         [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
  39         [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
  40         [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
  41         [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
  42 };
  43
  44 static int show_diag_stat(struct seq_file *m, void *v)
  45 {
  46         struct diag_stat *stat;
  47         unsigned long n = (unsigned long) v - 1;
  48         int cpu, prec, tmp;
  49
  50         get_online_cpus();
  51         if (n == 0) {
  52                 seq_puts(m, "         ");
  53
  54                 for_each_online_cpu(cpu) {
  55                         prec = 10;
  56                         for (tmp = 10; cpu >= tmp; tmp *= 10)
  57                                 prec--;
  58                         seq_printf(m, "%*s%d", prec, "CPU", cpu);
  59                 }
  60                 seq_putc(m, '\n');
  61         } else if (n <= NR_DIAG_STAT) {
  62                 seq_printf(m, "diag %03x:", diag_map[n-1].code);
  63                 for_each_online_cpu(cpu) {
  64                         stat = &per_cpu(diag_stat, cpu);
  65                         seq_printf(m, " %10u", stat->counter[n-1]);
  66                 }
  67                 seq_printf(m, "    %s\n", diag_map[n-1].name);
  68         }
  69         put_online_cpus();
  70         return 0;
  71 }
  72
  73 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos)
  74 {
  75         return *pos <= nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
  76 }
  77
  78 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos)
  79 {
  80         ++*pos;
  81         return show_diag_stat_start(m, pos);
  82 }
  83
  84 static void show_diag_stat_stop(struct seq_file *m, void *v)
  85 {
  86 }
  87
  88 static const struct seq_operations show_diag_stat_sops = {
  89         .start  = show_diag_stat_start,
  90         .next   = show_diag_stat_next,
  91         .stop   = show_diag_stat_stop,
  92         .show   = show_diag_stat,
  93 };
  94
  95 static int show_diag_stat_open(struct inode *inode, struct file *file)
  96 {
  97         return seq_open(file, &show_diag_stat_sops);
  98 }
  99
 100 static const struct file_operations show_diag_stat_fops = {
 101         .open           = show_diag_stat_open,
 102         .read           = seq_read,
 103         .llseek         = seq_lseek,
 104         .release        = seq_release,
 105 };
 106
 107
 108 static int __init show_diag_stat_init(void)
 109 {
 110         debugfs_create_file("diag_stat", 0400, NULL, NULL,
 111                             &show_diag_stat_fops);
 112         return 0;
 113 }
 114
 115 device_initcall(show_diag_stat_init);
 116
 117 /*
 118  * Diagnose 14: Input spool file manipulation
 119  */
 120 static inline int __diag14(unsigned long rx, unsigned long ry1,
 121                            unsigned long subcode)
 122 {
 123         register unsigned long _ry1 asm("2") = ry1;
 124         register unsigned long _ry2 asm("3") = subcode;
 125         int rc = 0;
 126
 127         asm volatile(
 128                 "   sam31\n"
 129                 "   diag    %2,2,0x14\n"
 130                 "   sam64\n"
 131                 "   ipm     %0\n"
 132                 "   srl     %0,28\n"
 133                 : "=d" (rc), "+d" (_ry2)
 134                 : "d" (rx), "d" (_ry1)
 135                 : "cc");
 136
 137         return rc;
 138 }
 139
 140 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
 141 {
 142         diag_stat_inc(DIAG_STAT_X014);
 143         return __diag14(rx, ry1, subcode);
 144 }
 145 EXPORT_SYMBOL(diag14);
 146
 147 /*
 148  * Diagnose 210: Get information about a virtual device
 149  */
 150 int diag210(struct diag210 *addr)
 151 {
 152         /*
 153          * diag 210 needs its data below the 2GB border, so we
 154          * use a static data area to be sure
 155          */
 156         static struct diag210 diag210_tmp;
 157         static DEFINE_SPINLOCK(diag210_lock);
 158         unsigned long flags;
 159         int ccode;
 160
 161         spin_lock_irqsave(&diag210_lock, flags);
 162         diag210_tmp = *addr;
 163
 164         diag_stat_inc(DIAG_STAT_X210);
 165         asm volatile(
 166                 "       lhi     %0,-1\n"
 167                 "       sam31\n"
 168                 "       diag    %1,0,0x210\n"
 169                 "0:     ipm     %0\n"
 170                 "       srl     %0,28\n"
 171                 "1:     sam64\n"
 172                 EX_TABLE(0b, 1b)
 173                 : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
 174
 175         *addr = diag210_tmp;
 176         spin_unlock_irqrestore(&diag210_lock, flags);
 177
 178         return ccode;
 179 }
 180 EXPORT_SYMBOL(diag210);